Discharge-valve for fluid-compressors.



PATENTBD SEPT. s, 190'?.

l N. A.'GHRISTBNSEN. DISCHARGE VALVE POR FLUID GOMPRESSORS.

APPLICATION FILED DEO.11, 1899.

UNITED .STATES PATENT oEEIoE. f

NIEIIS ANTON CHRIS'IIENSEN, OF MILWAUKEE, WISCONSIN.'

DISCHARGE-VALVE Fon-'FLUrD-comrnnssons Specification of Letters Patent.

Patented Sept. A 3, 1907.

Original applicationled September 9, 1899, Serial No. 72 9,957. Dividedand this-applicati@ filed December 11. 1899.;

' l Serial No. 789.898.

To all whom it may concern:

Be it known that I, NIELs ANTON CHnIsTENsEN, residing at Milwaukee,inthe county of Milwaukee and State oi Wisconsin, have invented certainnew and usepressure compressore I My invention pertains to fluidcompressors, particu` larly to the discharge valve therefor, and its object is to v produce a' novel and eflicient device of this character,

more especially adapted for use in connection with a high pressure fiuidcompressor, such as used, for instance, in compressing air to a highdegree in a single stage, although it will be understood that myinvention may be applied wherever applicable.

` truncated 4conical end portion 9 and also having behind In theaccompanying drawing, Figure l is a sectional. elevation of one` form ofcompressor showing my discharge valve applied; Fig. 2, an enlargedsection of the discharge valve; and Fig. 3, an 'enlarged elevation ofthe valve with a part broken away, thesame being the full size of theactual valve,

yinasmuch as this application is limited to the construction of thedischarge valve of a compressor, it will be understood that the othernecessary parts of the compressor may be of any well known or desiredconstruction, and in the drawing I have representedas one exempliicationa complete apparatus more particularly designed for obtaining highpressure in a single stage, although it will be understood that thefeatures l of mydischarge valve are not to be limited to theemthcrefore, of the compressor outside of valve will be general. l

The main frame or compressor casing 1 hasa cylinder 2 in which isadapted toreciprocate a single acting pis-l ton 3. The `end of thischamber is closed by anyv suitable backhead or cover '4 and in thiscover is preferably located the discharge valve about to be described.The chamber also has a suction valve device 5 which may, for thepurposesof this invention, be of any suitable construction and operation. i xThedischarge valve is adapted to govern the disthe discharge 'charge port 6in the back cover, which is provided with a cylindrical bore or chamber7 in axial alinement with such discharge port. `The discharge valvepreferably consists of a hollow and closed cylindrical stem 8 freelymovable in such cylindrical chamber and having a such portion an obliqueannular seatproper 10, l0- cated at the base of the walls of the stem orcylinder and adapted togclose upon afseat 11Min such Vdischarge port,which is shaped so as to correspond with the form of this end lof thevalve, but not so as lto permit the por- *y tion 9 to seat on the port,there being but the slightest -`clearance at this point, `the objectbeing to have the discharge port or passagefilled to eliminate clearancebut to have only a portion of thelyalve actually seated.,`

The function of this valve is to permit the discharge of air from thevcylinder 2 and into a passage l2 adapted to communicate directlyorindirectly with any suitable reservoir.

The outer end of the stem 8 is constructed in the form of a cup whichmay be done either by making such end integral, or, as shown, bysecuring therein a cup-shaped piece or thimble 13.` As clearly shown inFig. 3 the outer end of this thimble is provided with a marginal flangeagainst which the outer end -of the cylinder bears. The outer end of thecylindrical chamber 7 is counterbored and screw-threaded to receivetahollow nut 14, which `receives the'outer end of the stem 8 and isadapted' to seat upon ashoulder 15. A spring 16 is interposed betweenthe bottom of the cup 13 and the inner end of the hollow nut 14.Inasmuch as lthe spring thus bears against the valve at its end oppositethe discharge port, where considerable heat is generated by the greatcompression, there is no liability of such spring losing its temper byreason of the heat adjacent to the discharge port, owing to itsremoteness therefrom, the heat being radiated, 'at least in greatmeasure, to the circulating water before reaching the outer end of thevalve.

The operation of the valve will be read ily understood from thedescription already given. It is obvious that the air compressed in thecylinder will open the dis-l charge valve against the tension of itsspringl, permitting the discharge air to flow to the reservoir throughthe passage 12. More particularly in high pressure compressors, it isnecessary to eradicate or at least to limit to a minimum the amount ofclearance ofthe discharge-valve, as well as of the suction valve.

the valve body almost completely fills the discharge port, but theconstruction is not such as to cause the valve to be unreliable becausethe valve is provided with an annular seat so that the valve does notseat upon the entire surface ofthe discharge port. The discharge valveis thus a hollow imperforate cylinder having the valve proper at itsinner end and sealed at its outer end by means of the thimble 13 whichas herein shown has a marginal ange arranged tolbear against the outeredge or end ot` the cylinder. l Moreover, the discharge valve is solocated in the head of the compression cylinder that it is surrounded onallsides by the water of. the water jacket thereof, with the result thatthe valve is In the construction shown, I have accomplished thisresultby making the clearance practically nothing' inasmuch as kept cool andlikewise the spring- 16 which is compara'- cover as that it can not onlybe readily assembled, but

can be removed therefrom in an easy and ready manner by simplyunscrewing the nut 14, which is extraneous of the back cover, and thenwithdrawing the discharge valve. Furthermore, my construction providesan extremely simple form of valve which is very desirable in this typeof apparatus where the functions thereof must be performed at alltimes,both positively and efficiently, with little or no liability ofinjury and with comparatively little wear. Y. I

Although I have described more or less precise forms and details ofconstruction, I do not intend to be understood as limiting myselfthereto, as I contemplate changes in form, the proportion of parts andthe substitution of equivalents as circumstances may suggest orrender-expedient, and without departing from the spirit of my invention.

I claim l 1. A compressor discharge valve comprising, in combinationwith the compressor'casing, a cylinder having (its inner end closed andforming a valve proper arranged to seat to close the discharge port, aclosed thimble 13 sesaid thimbleheing open at its outer end to form asocket,

theoutenend Bf such cylinder, and aspring interposed `between thethimble and the cap and received within the socket of the thimble.

.2. `A compressor discharge valve comprising, in combinaend withcorresponding differential tapers, the tapered.

portion 10 alone seating in said port, and the other portion 9 lling itspart-of the discharge port but not seating thereon with any pressure. 'A

3; A compi-essor discharge valve comprising,A ln combination with acylinder havingl a discharge port which is of dierential taper, acylinder having a closed inner end of corresponding differential tapers,the tapered portion'll) thereof alone seating and located at the hase'of the walls of the cylinder.

4. A compressor discharge valve comprising, a hollow cylinder whoseinner end isv closed to form a valve proper to seat upon and govern adischarge port, and a tliimlilc secured in the outer end of suchcylinder' to seal the snmc cured 'in the outer vend of Rthe.cyl-inciertoclosensuchwend,

and ,having a marginal flange against whiclrthe outer end I i Witnesses:

A. E. BALDWIN, SAMUEL E. lIiinmN.

